Pre-stack combining of over/under seismic data

Abstract

The present invention provides a method for pre-stack combining of over/under seismic data. The method includes determining a calibration filter using a first pre-stack marine seismic data set acquired at a first depth and a second pre-stack marine seismic data set acquired at a second depth, wherein the second depth is greater than the first depth and determining a third data set based upon the first pre-stack marine seismic data set, the second pre-stack marine seismic data set, and the calibration filter.

1. A method, comprising:
 determining a calibration filter using a first pre-stack marine seismic data set acquired at a first depth and a second pre-stack marine seismic data set acquired at a second depth, wherein the second depth is greater than the first depth, and accounting for non-ideal conditions departing from a flat sea approximation; and 
 determining a third data set based upon the first pre-stack marine seismic data set, the second pre-stack marine seismic data set, and the calibration filter. 
 
   
   
     2. The method of  claim 1 , wherein determining the calibration filter using the first pre-stack marine seismic data set and the second pre-stack marine seismic data set comprises determining the calibration filter using first and second pressure wave fields. 
   
   
     3. The method of  claim 1 , wherein determining the calibration filter comprises determining the calibration filter using a cross-ghosting technique. 
   
   
     4. The method of  claim 1 , wherein determining the calibration filter comprises determining the calibration filter using a least-squares criteria. 
   
   
     5. The method of  claim 1 , wherein determining the calibration filter comprises determining the calibration filter using first and second pre-stack marine seismic data sets acquired within at least one of a selected time window, a selected offset window, a selected gather, a selected shot gather, and a selected receiver gather. 
   
   
     6. The method of  claim 1 , wherein determining the third data set comprises determining at least one of an up-going wave field and a down-going wave field using an over/under combination of the first and second pre-stack marine seismic data sets. 
   
   
     7. An article comprising one or more machine-readable storage media containing instructions that when executed enable a computer to:
 determine a calibration filter using a first pre-stack marine seismic data set acquired at a first depth and a second pre-stack marine seismic data set acquired at a second depth, wherein the second depth is greater than the first depth, and accounting for non-ideal conditions departing from a flat sea approximation; and 
 determine a third data set based upon the first pre-stack marine seismic data set, the second pre-stack marine seismic data set, and the calibration filter. 
 
   
   
     8. The article of  claim 7 , wherein the one or more machine-readable storage media contain instructions that when executed enable a computer to determine the calibration filter using first second pressure wave fields. 
   
   
     9. The article of  claim 7 , wherein the one or more machine-readable storage media contain instructions that when executed enable a computer to determine the calibration filter using a cross-ghosting technique. 
   
   
     10. The article of  claim 7 , wherein the one or more machine-readable storage media contain instructions that when executed enable a computer to determine the calibration filter using first and second pre-stack marine seismic data sets acquired within at least one of a selected time window, a selected offset window, a selected gather, a selected shot gather, and a selected receiver gather. 
   
   
     11. The article of  claim 7 , wherein the one or more machine-readable storage media contain instructions that when executed enable a computer to determine at least one of an up-going wave field and a down-going wave field using an over/under combination of the first and second pre-stack marine seismic data sets. 
   
   
     12. An article comprising one or more machine-readable storage media containing data structures and data formed by:
 determining a calibration filter using a first pre-stack marine seismic data set acquired at a first depth and a second pre-stack marine seismic data set acquired at a second depth, wherein the second depth is greater than the first depth, and accounting for non-ideal conditions departing from a flat sea approximation; and 
 determining a third data set based upon the first pre-stack marine seismic data set, the second pre-stack marine seismic data set, and the calibration filter. 
 
   
   
     13. The article of  claim 12 , comprising one or more machine-readable storage media containing data structures and data formed by determining the calibration filter using first second pressure wave fields. 
   
   
     14. The article of  claim 12 , comprising one or more machine-readable storage media containing data structures and data formed by determining the calibration filter using a cross-ghosting technique. 
   
   
     15. The article of  claim 12 , comprising one or more machine-readable storage media containing data structures and data formed by determining the calibration filter using first and second pre-stack marine seismic data sets acquired within at least one of a selected time window, a selected offset, a selected gather, a selected shot gather, and a selected receiver gather. 
   
   
     16. The article of  claim 12 , comprising one or more machine-readable storage media containing data structures and data formed by determining at least one of an up-going wave field and a down-going wave field using an over/under combination of the first and second pre-stack marine seismic data sets. 
   
   
     17. A computer programmed to:
 determine a calibration filter using a first pre-stack marine seismic data set acquired at a first depth and a second pre-stack marine seismic data set acquired at a second depth, wherein the second depth is greater than the first depth, and accounting for non-ideal conditions departing from a flat sea approximation; and 
 determine a third data set based upon the first pre-stack marine seismic data set, the second pre-stack marine seismic data set, and the calibration filter. 
 
   
   
     18. The computer of  claim 17  programmed to determine the calibration filter using first and second pre-stack marine seismic data sets acquired within at least one of a selected time window, a selected offset, a selected gather, a selected shot gather, and a selected receiver gather. 
   
   
     19. The computer of  claim 17  programmed to determine at least one of an up-going wave field and a down-going wave field using an over/under combination of the first and second pre-stack marine seismic data sets.